"We have only waded ankle-deep in faith as yet. We though the water very cold and chill when we timorously ventured in; but having tried it up to the ankles, we have found it good and pleasant. Let us advance until we are breast-deep, yea, and deeper. Blessed is that man who gets his feet off the bottom, and swims in the stream where he has no hope but his God" (Charles Spurgeon, An All-Round Ministry, p. 28).
For more go here: The Spurgeon Archive. The archive is a magnificent resource for all things Spurgeon -- one of the great preachers of the last 2 millennia.